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Diarium vs Penzu: catalog facts
Diarium	Penzu
Freemium Free to start; Diarium Pro is a one-time purchase per platform.	Free Free to start, with unlimited entries at no cost.
Windows, macOS, Android, iOS	Android, iOS, Web
No account needed to start Sync through your own OneDrive, Google Drive, Dropbox, iCloud or WebDAV	Unlimited entries on the free plan Encryption and per-entry or per-journal locking
Pro must be bought separately on each platform Closed source	Journals are stored on Penzu's service rather than in files you own Built for journaling, not general note-taking
Downloadable app	Downloadable app, Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
No account needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.